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BUG: GH17525 Function _get_standard_colors resets global random seed #17730

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Merged
merged 14 commits into from
Oct 3, 2017
Merged

BUG: GH17525 Function _get_standard_colors resets global random seed #17730

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3f0db16
BUG: GH17525 Removed the random seed reset in _style.py
cmazzullo Sep 30, 2017
6ec894b
Added bug documentation to doc/source/whatsnew/v0.21.0.txt
cmazzullo Sep 30, 2017
f38bf55
BUG: GH17525 Change function _get_standard_colors to avoid resetting …
cmazzullo Sep 30, 2017
831f70f
Flake8 formatting compliance
cmazzullo Sep 30, 2017
3bf3c0e
Added docstring to internal `random_color` function
cmazzullo Oct 1, 2017
2f3da72
BUG: GH17525 Added test to check for random seed reset
cmazzullo Oct 1, 2017
bf9678b
Fixed whitespace for PEP8
cmazzullo Oct 1, 2017
f711dd1
Used pandas.core.common._random_state to avoid resetting the seed
cmazzullo Oct 1, 2017
92dbac3
Changed whatsnew to reference the user-visible issue
cmazzullo Oct 1, 2017
4041102
Add tolist() to _get_standard_colors to return the correct type
cmazzullo Oct 2, 2017
6e4e3e5
Changed whatsnew to be clearer
cmazzullo Oct 2, 2017
e4f1b0e
Set the random seed in `random_color` to ensure consistent colors are…
cmazzullo Oct 2, 2017
54b2138
Removed `range` import
cmazzullo Oct 2, 2017
092c2d5
change test comment
jorisvandenbossche Oct 3, 2017
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1 change: 1 addition & 0 deletions doc/source/whatsnew/v0.21.0.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -614,6 +614,7 @@ Plotting
- Line plots no longer assume monotonic x data when calculating xlims, they show the entire lines now even for unsorted x data. (:issue:`11310`, :issue:`11471`)
- With matplotlib 2.0.0 and above, calculation of x limits for line plots is left to matplotlib, so that its new default settings are applied. (:issue:`15495`)
- Bug in ``Series.plot.bar`` or ``DataFramee.plot.bar`` with ``y`` not respecting user-passed ``color`` (:issue:`16822`)
- Bug causing ``plotting.parallel_coordinates`` to reset the random seed when using random colors (:issue:`17525`)


Groupby/Resample/Rolling
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8 changes: 5 additions & 3 deletions pandas/plotting/_style.py
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Expand Up @@ -111,11 +111,13 @@ def _get_standard_colors(num_colors=None, colormap=None, color_type='default',
if isinstance(colors, compat.string_types):
colors = list(colors)
elif color_type == 'random':
import random
from pandas.core.common import _random_state

def random_color(column):
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I don't think random provides a context manger, maybe do this like:

rstate = random.getstate()
try:
    random.seed(...)
    return = [random...... ]
finally:
    random.setstate(rstate)

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actually just use this

In [20]: rs = pandas.core.common._random_state()

In [21]: rs.rand(3)
Out[21]: array([ 0.6786481 ,  0.94231001,  0.03334007])

random.seed(column)
return [random.random() for _ in range(3)]
""" Returns a random color represented as a list of length 3"""
# GH17525 use common._random_state to avoid resetting the seed
rs = _random_state(column)
return rs.rand(3).tolist()

colors = lmap(random_color, lrange(num_colors))
else:
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17 changes: 17 additions & 0 deletions pandas/tests/plotting/test_misc.py
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Expand Up @@ -284,3 +284,20 @@ def test_subplot_titles(self):
title=title[:-1])
title_list = [ax.get_title() for sublist in plot for ax in sublist]
assert title_list == title[:3] + ['']

def test_get_standard_colors_random_seed(self):
""" For #17525 """
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Generally, we just add a comment above, not a docstring.

df = DataFrame(np.zeros((10, 10)))

# Make sure that the random seed isn't reset by _get_standard_colors
plotting.parallel_coordinates(df, 0)
rand1 = random.random()
plotting.parallel_coordinates(df, 0)
rand2 = random.random()
assert rand1 != rand2

# Make sure it produces the same colors every time it's called
from pandas.plotting._style import _get_standard_colors
color1 = _get_standard_colors(1, color_type='random')
color2 = _get_standard_colors(1, color_type='random')
assert color1 == color2